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awk: print only lines that come after specific guard line pattern
Find files with a specific 2-line pattern using awkAwk command to print all the lines except the last three linesdiffrence between two files of different row numbersAWK print from pattern to patternawk: match pattern that contain only forward slashgrepping patterns in a json fileHow to delete all the lines that match specific conditionDelete lines that come after a line with a specific pattern in ShellParsing Text File By Column PatternAWK split file on pattern and name new files after string in first line after pattern
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty
margin-bottom:0;
Consider this file:
#!/usr/bin/env bash
cat > example_file.txt <<EOL
|dms,wew,qwqw|
|m|head1|
|3,4,6|
|3e,2,23|
|m|head2|
|xw,12,2123|
|23,d,213|
|23,22q,2skl|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
EOL
Every once in a while, there will be a
guard pattern: a line that starts with:
|m|
(yes, the first line of the file need not
be a guard pattern)
Now I only want to print those lines
for which the last guard pattern was:
|m|head1|
and ignore all other lines.
In other worst, I would like the output to be:
#!/usr/bin/env bash
cat > desired_result_file.txt <<EOL
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
EOL
command-line awk
asked Sep 21 at 23:32
user2413user2413
9,10913 gold badges43 silver badges68 bronze badges
add a comment
|
Consider this file:
#!/usr/bin/env bash
cat > example_file.txt <<EOL
|dms,wew,qwqw|
|m|head1|
|3,4,6|
|3e,2,23|
|m|head2|
|xw,12,2123|
|23,d,213|
|23,22q,2skl|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
EOL
Every once in a while, there will be a
guard pattern: a line that starts with:
|m|
(yes, the first line of the file need not
be a guard pattern)
Now I only want to print those lines
for which the last guard pattern was:
|m|head1|
and ignore all other lines.
In other worst, I would like the output to be:
#!/usr/bin/env bash
cat > desired_result_file.txt <<EOL
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
EOL
command-line awk
asked Sep 21 at 23:32
user2413user2413
9,10913 gold badges43 silver badges68 bronze badges
add a comment
|
Consider this file:
#!/usr/bin/env bash
cat > example_file.txt <<EOL
|dms,wew,qwqw|
|m|head1|
|3,4,6|
|3e,2,23|
|m|head2|
|xw,12,2123|
|23,d,213|
|23,22q,2skl|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
EOL
Every once in a while, there will be a
guard pattern: a line that starts with:
|m|
(yes, the first line of the file need not
be a guard pattern)
Now I only want to print those lines
for which the last guard pattern was:
|m|head1|
and ignore all other lines.
In other worst, I would like the output to be:
#!/usr/bin/env bash
cat > desired_result_file.txt <<EOL
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
EOL
command-line awk
asked Sep 21 at 23:32
user2413user2413
9,10913 gold badges43 silver badges68 bronze badges
Consider this file:
#!/usr/bin/env bash
cat > example_file.txt <<EOL
|dms,wew,qwqw|
|m|head1|
|3,4,6|
|3e,2,23|
|m|head2|
|xw,12,2123|
|23,d,213|
|23,22q,2skl|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
EOL
Every once in a while, there will be a
guard pattern: a line that starts with:
|m|
(yes, the first line of the file need not
be a guard pattern)
Now I only want to print those lines
for which the last guard pattern was:
|m|head1|
and ignore all other lines.
In other worst, I would like the output to be:
#!/usr/bin/env bash
cat > desired_result_file.txt <<EOL
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
EOL
command-line awk
command-line awk
asked Sep 21 at 23:32
user2413user2413
9,10913 gold badges43 silver badges68 bronze badges
asked Sep 21 at 23:32
user2413user2413
9,10913 gold badges43 silver badges68 bronze badges
asked Sep 21 at 23:32
user2413user2413
9,10913 gold badges43 silver badges68 bronze badges
asked Sep 21 at 23:32
user2413user2413
9,10913 gold badges43 silver badges68 bronze badges
asked Sep 21 at 23:32
user2413user2413
9,10913 gold badges43 silver badges68 bronze badges
9,10913 gold badges43 silver badges68 bronze badges
add a comment
|
add a comment
|
1 Answer
1
active
oldest
votes
Regex-oriented
$ awk '/^|m|/ head1 p' example_file.txt
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
or field-oriented
$ awk -F'|' '$2 == "m" $3 == "head1" ? p=1 : p=0 p' example_file.txt
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
p is effectively a print flag.
Awk programs consist of pattern action pairs, in which action is executed on a record if pattern evaluates true (non-zero). You can omit pattern - in which case action is evaluated for every record - or omit action in which case awk applies the default pattern, which is to print the record: the latter is what's happening here.
answered Sep 21 at 23:57
steeldriversteeldriver
82.5k12 gold badges134 silver badges223 bronze badges
How does the variable p work to control printing? I see how it is set, but where is that explained in the awk manual, etc.?
– Joe
Sep 26 at 8:03
@Joe I have added some explanation of thep
– steeldriver
Sep 26 at 11:51
add a comment
|
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Regex-oriented
$ awk '/^|m|/ head1 p' example_file.txt
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
or field-oriented
$ awk -F'|' '$2 == "m" $3 == "head1" ? p=1 : p=0 p' example_file.txt
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
p is effectively a print flag.
Awk programs consist of pattern action pairs, in which action is executed on a record if pattern evaluates true (non-zero). You can omit pattern - in which case action is evaluated for every record - or omit action in which case awk applies the default pattern, which is to print the record: the latter is what's happening here.
answered Sep 21 at 23:57
steeldriversteeldriver
82.5k12 gold badges134 silver badges223 bronze badges
How does the variable p work to control printing? I see how it is set, but where is that explained in the awk manual, etc.?
– Joe
Sep 26 at 8:03
@Joe I have added some explanation of thep
– steeldriver
Sep 26 at 11:51
add a comment
|
Regex-oriented
$ awk '/^|m|/ head1 p' example_file.txt
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
or field-oriented
$ awk -F'|' '$2 == "m" $3 == "head1" ? p=1 : p=0 p' example_file.txt
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
p is effectively a print flag.
Awk programs consist of pattern action pairs, in which action is executed on a record if pattern evaluates true (non-zero). You can omit pattern - in which case action is evaluated for every record - or omit action in which case awk applies the default pattern, which is to print the record: the latter is what's happening here.
answered Sep 21 at 23:57
steeldriversteeldriver
82.5k12 gold badges134 silver badges223 bronze badges
How does the variable p work to control printing? I see how it is set, but where is that explained in the awk manual, etc.?
– Joe
Sep 26 at 8:03
@Joe I have added some explanation of thep
– steeldriver
Sep 26 at 11:51
add a comment
|
Regex-oriented
$ awk '/^|m|/ head1 p' example_file.txt
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
or field-oriented
$ awk -F'|' '$2 == "m" $3 == "head1" ? p=1 : p=0 p' example_file.txt
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
p is effectively a print flag.
Awk programs consist of pattern action pairs, in which action is executed on a record if pattern evaluates true (non-zero). You can omit pattern - in which case action is evaluated for every record - or omit action in which case awk applies the default pattern, which is to print the record: the latter is what's happening here.
answered Sep 21 at 23:57
steeldriversteeldriver
82.5k12 gold badges134 silver badges223 bronze badges
Regex-oriented
$ awk '/^|m|/ head1 p' example_file.txt
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
or field-oriented
$ awk -F'|' '$2 == "m" $3 == "head1" ? p=1 : p=0 p' example_file.txt
|m|head1|
|3,4,6|
|3e,2,23|
|m|head1|
|dljs,wqpw,2;a|
|dllw,w1p,1q;a|
p is effectively a print flag.
Awk programs consist of pattern action pairs, in which action is executed on a record if pattern evaluates true (non-zero). You can omit pattern - in which case action is evaluated for every record - or omit action in which case awk applies the default pattern, which is to print the record: the latter is what's happening here.
answered Sep 21 at 23:57
steeldriversteeldriver
82.5k12 gold badges134 silver badges223 bronze badges
edited Sep 26 at 11:50
answered Sep 21 at 23:57
steeldriversteeldriver
82.5k12 gold badges134 silver badges223 bronze badges
answered Sep 21 at 23:57
steeldriversteeldriver
82.5k12 gold badges134 silver badges223 bronze badges
answered Sep 21 at 23:57
steeldriversteeldriver
82.5k12 gold badges134 silver badges223 bronze badges
82.5k12 gold badges134 silver badges223 bronze badges
How does the variable p work to control printing? I see how it is set, but where is that explained in the awk manual, etc.?
– Joe
Sep 26 at 8:03
@Joe I have added some explanation of thep
– steeldriver
Sep 26 at 11:51
add a comment
|
How does the variable p work to control printing? I see how it is set, but where is that explained in the awk manual, etc.?
– Joe
Sep 26 at 8:03
@Joe I have added some explanation of thep
– steeldriver
Sep 26 at 11:51
How does the variable p work to control printing? I see how it is set, but where is that explained in the awk manual, etc.?
– Joe
Sep 26 at 8:03
How does the variable p work to control printing? I see how it is set, but where is that explained in the awk manual, etc.?
– Joe
Sep 26 at 8:03
@Joe I have added some explanation of the
p– steeldriver
Sep 26 at 11:51
@Joe I have added some explanation of the
p– steeldriver
Sep 26 at 11:51
add a comment
|
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